On attempt to create a container backup in OBAS the following message can be found under Top > Configuration Director > Logging and Errors > Action Log:
Create backup; Start creating new backup for Container 12345 Backup disk space is full on the target node. (error# 1)
The size of existing backups and affected container backup size in total exceed
Maximal size of all backups parameter set for related hardware node.
The following can be found in
[2017/04/02 21:47:51] [WARN]  [HSPC::CC::BackupAction::create_backup] [BackupAction/Task]: Backup fail. Target node has size for backup:107374182400, already used size 49825287815, backuped Virtuozzo Container size 59640838062.08
Maximal size of all backups parameter under Top > Service Director > Virtuozzo Manager > Setup > Nodes Backup Settings tab >
<hardware_node_name> or free up disk space consumed by backups.